Its really not a performance mod so much as a turbo longevity mod. When you tune up the truck the stock turbo can surge and shorten the life quite a bit. If you don't plan on running larger injectors and you want lots of whistle then go for it. If you do plan on bigger injectors down the road then I would consider putting the money on an aftermarket turbo instead. I don't plan on anymore mods other then some custom tuning and maybe a dual hpop so what I have will be sufficient.